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Are you using one of the public servers such as http://sagenb.org? If so, you get the red bar because the server resets worksheets after 10 minutes of CPU time has elapsed. I configured it this way because there are tens of thousands of accounts, everything runs on a single computer (right now), and I wanted to control usage. Now that scalability has been improving a lot (due to work of Mike Hansen and others), I'll likely increase this time substantially.